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src/Dotnet.Samples.AspNetCore.WebApi/Data/PlayerDbContext.cs

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+using Dotnet.Samples.AspNetCore.WebApi.Models;
+using Dotnet.Samples.AspNetCore.WebApi.Utilities;
+using Microsoft.EntityFrameworkCore;
+
+namespace Dotnet.Samples.AspNetCore.WebApi.Data;
+
+/// <summary>
+/// Represents the EF Core database context for a Player entity.
+/// Inherits from <see cref="DbContext"/> and provides a bridge between the entity and the database.
+/// </summary>
+public class PlayerDbContext(DbContextOptions<PlayerDbContext> options) : DbContext(options)
+{
+    /// <summary>
+    /// Gets or sets the <see cref="DbSet{TEntity}"/> representing a collection of Player entities.
+    /// <see cref="DbSet{TEntity}"/> corresponds to a table in the database, allowing CRUD operations and LINQ queries.
+    /// </summary>
+    public DbSet<Player> Players => Set<Player>();
+
+    /// <summary>
+    /// Configures the model for the Player entity.
+    /// This method is called by the runtime to configure the model for the context.
+    /// </summary>
+    /// <param name="modelBuilder">The model builder.</param>
+    /// <remarks>
+    /// This method is used to configure the model and relationships using the Fluent API.
+    /// It is called when the model for a derived context is being created.
+    /// </remarks>
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        modelBuilder.Entity<Player>(entity =>
+        {
+            entity.HasKey(player => player.Id);
+            entity.Property(player => player.Id).ValueGeneratedOnAdd();
+            entity.HasIndex(player => player.SquadNumber).IsUnique();
+            entity.HasData(PlayerData.MakeStarting11WithId());
+            entity.HasData(PlayerData.GetSubstitutesWithId());
+        });
+    }
+}